Air-brush nozzle



Nov. 23 1926.

A. SHELBURNE AIR BRUSH NozzLE Nov. 23 1926. 1,608,438

v A. SHELBURNE AIR BRUSH NOZZLE Filed June 4, 1925 2 Sheets-Sheet 2jme/y fr f 'e/ afp@ Patented Nov. 23, 1926.

PATENT OFFICE.

AUGUSTINE SHELBURNE, F SOUTH PASADENA, CALIFORNIA.

AIR-BRUSH N OZZLE.

Application led June 4,

This invention relates to air brushes and more particularly to air brushnozzles and the object of this invention is to provide an air brushnozzle which will produce a uniform spray.

Another object is to provide an air brush nozzle in which the innerliquid ,nozzle is formed integral with an outer air nozzle.

These objects are attained by the disclosure herein set forth by thefollowing description of the accompanying drawings, in which:

Figure 1 is a vertical section taken through an air brush having theimproved nozzle applied thereto. y

Fig. 2 is a front elevation of the air brush nozzle. A

Fig. 3 is a section through the air brush nozzle and a portion of theair brush taken on line 3-3 of Fig. 1.

Fig. 4 is a rear end elevation of the air brush nozzle with the capremover.

Fig. 5 is a side elevation analogous to Fig. 4. v

Z5 Fig. 6 is a front elevation of the air-brush nozzle.

Fig. 7 isa section to the air brush nozzle, taken on the line 7-7 ofFig. 6.

Fig. 8 is a front elevation of the cap of the air brush nozzle.

Fig. 9 is a Side elevation of the cap.

Fig. 10 is a section through the cap taken on the line 10--10 of Fig. 8.

Referring by numerals to the accompanying drawings, an air brush isgenerally designated at 10, having a barrel 11 and a delivery headgenerally designated at 12. The barrel 11 terminates in extension 13having a tapered bore 14 through whichv ext-ends a tapered shank 15formed on the lower portion of the delivery head 12. The shank 15 isprovided with a bore 16 which enters a horizontal bore 17 formed in ahorizontal portion 18. terminating in a threaded porf tion- 19. Thelower portion of the shank 15 is threaded as indicated at 20 and isadapted to receive a cou ling 21, carrying a paint tube 22. The hea 13of the barrel 11 has a fiat bottom face 23 and an annular depending boss24.

A cap generally designated at 25 has an opening 26 adapted to receivethe boss 24.v 'The cap 25 has a flat face 27 and is held in 1925. serialno. 34,801.

place on the extension 13 by a screw 2S. The deliveryhead having theshank l5 is 55 held in place by an expansion coilspring 29 engaging thenut 30. A horizontal bore 31 extends through the barrel ll and enters auannular recess 32 formed in the extension 13. The shank 15 hasan annularrecess 33-ad- 60 jacent the recess 32 and oppositelyI disposed lateralopenings 34 form a passage between the recesses 32 and 33.v

The vertical bores 35 extend upwardly y, from the recess 33 and meetwith horizontal 65 bores 36 which enter an annular depression 37 formedin the end of the horizontal por tion 18 of the delivery head 12.

The end of the portion 18 has a fiat face 38 and is of cylindrical`form. The air 70 brush nozzle constituting the invention is generallydesignated at N and is constructed as follows:

The air brush nozzle is preferably formed from a piece of hexagon brassrod and has a tapered external face 39 which is of slightly lessdiameter than the hexagon head 40. The inner liquid delivery nozzle isformed within the center of the nozzle and has an internal bore 41 andextends outwardly and 8 rearwardly beyond the head 40 and terminates ina threaded shank 42.

The head 40 has an annular depression 43 and a counter-bore 44 adaptedto engage the face 38 and extend over the edge ot' the B5 cylindricalportion of the portion 18. A plurality of apertures 45 extend inwardlyfrom the depression 43 and enteran annular opening 46 formed in theforward end of l the nozzle which forms the end of the outer nozzle 47The annular opening 46 is threaded as indicated at 46st and' terminatesin an internal tapered seat 48 which is of slightly larger diameter thanthe external diameter of the threads 47.

`Four equally spaced lateral apertures 49 are formed in the nozzle andintersectthe apertures 45 for a purpose later described. The exterior ofthe inner nozzle is tapered as indicated at 50 and terminates in a cym0lindrical tip 51, the interior of the nozzle being tapered as indicatedat 52 and termii hating in an internal straight bore 53, within the tip51.

In order to concentrate the flow of air passing through the apertures 45and annutapered -bore 54 terminating in a flat faceI 54, and has a fiatouter face 55 and an opening 56 is formed in thecenter of the cap.

The exterior of the cap has a fiat annular face 57 and upset threads 58are formed fthe up thereon. A tapered face 59 of slightly largerdiameter than the exterior of the threads 58, is formedv on. the cap onthe end opposite the' annular lface 57, within an in' ternal recess 60,infa head 60B. The threads 58. of the cap are adapted to engage thethreads 47 ofthe nozzle and when-screwed into place the-tapered face59engages the seat 48 and the opening 56 surrounds the tip 51, thusproviding.,r a uniform clearance generally designated at A between theinterior of theopening 56 and the exterior of It will benoted that'theannular face 57,

of the cap C, fits within the annular opening 46 of' the nozzle, andthat a clearance is.

lett between the end 47 of the nozzle and the internal recess 6 0 of thecap.

From the above it will be seen that an air brush nozzle having a-'uniform air passage surrounding the liquid nozzle is provided. Ifdesired, a spreader attachment may be provided, generally designated at61, which is adapted to fit over the exterior of the nozzle. Thespreader attachment is in the form of a frustum conical body 62, havingan internal tapered bore 63 adapted to engage the tapered face 39 ofthenozzle. The spreader is provided with aI pair of oppositely disposedextensions or wings 64, through which extend passages 65 entering aninternal annular recess 66, having apassage 67 adapted to registerwithin the lateral aperture 49. The spreader attachment is held in placeon the nozzle by a leaf spring 68 which engages the inner side of thecap C and projects into the recesses 69 formed in the wings 64. Thenozzle may be used with or without the spreader attachment.

A needle valve 70 having a reduced diameter point 71 .extends throughthe bore 17 and inner vnozzle 50. the reduced point 71 extending throughthe tip 51. The needle valve is adapted to regulate the flow oftheliquid from the inner nozzle and is mounted 1n a cylinder generallydesignated at 72, which is screw threaded into the portion 18 of thedelivery head, and is normally held in the position shown in Fig.' 1, byan expansion spring 73 within the cylinder 72 and engaging a head 74 onthe stem 70a of theneedle valve 70.

A sleeve 75 surrounds the cylinder 72 and a nut 76 is screw threaded onthe end of the needle valve. A trigger 77 is pivotally mountedat 78 onan arm 79 and a link 80 forms a connection between the trigger and.

the sleeve 75.

A check valve 81 is mounted ina recess 82 and engages a seat 83. Thecheck valve has a stem 84 which engages a in 85 on the trigger 77 and isheld seated y anexair regulating device vgenerally designated f at 92mounted on the end of the barrel 1 1.

The airbrush operates in the usual manner, namely, when'the tri ger 77is vpulled 'bacia-air will pass throng the passage 90,

the bore 31, into the recess 32, through vthe openings 34 into therecess 33, thence "i through the vertical and horizontal bones35.

and 36 where it is delivered to the airbrush nozzle. The air enterin thenozzle will pass through the plurality `o apertures 45, thence betweenthe internal bore 54 of the capfC.

and the exterior of the inner nozzle 50, thev iow' of the air beingconcentrated `-asv it.'

passes through the clearance A. It will be understood that whenthe'trigger is pulled l back to admit air, the needle valve'is alsopulled back by the mechanism shown, fin

order to increasethe flow"v of paint.

' When the spreader/ attachment the?. position shown in Figs. 1, 2 and3, a portionv of the air passingfthrough the a erturesfrt will enter thelateral Vopenings and pass into. the annular recess 66 Ain the spreaderattachment, thence throng 'the assage 67, and passages 65, which willdirect) sitely disposed streams of -air aghainst the atomized mixtureissuing from lt e nozzle proper, and produce a .fm-shaped s ray.

When it is desired tothe nozz e with.

out the spreader attachm'exltwhich produced 'the fan-shaped spray, thereader attachment is rotated 45 in'ether irection, which will bring thepassage .6Lout of. registration with anyone of the-'apertures 49,. thuscut- Y ting oi the air enterin the" assages 65.

the oppollt) Whenthe spreaderattac ment '1s in thev po- .sition shown inFigs. 1, 2 and 3, a vertical fan-shaped-spray is produced vand when thespreader attachment is rotated 90 a horizontal fan-shaped spray isproduced.. l

It will be particularly noted that the inner li uid nozzle and outer airnozzle are forme integral and that when the cap C is screwed into placethe opening 56 in the cap will be sitively and accurately ,cen iredaround tllg tip 51 of the inner liquid nozzle, due to the tapered facesof the cap engaging the tapered seat in the end of the outer air nozzle.Y

From the above it will be seen that an air brush nozzle is providedwhich will produce a uniform spray.

threaded portion, a cap having external threads to engage with theinternally threaded portion of the outer nozzle, an external taperedJface adapted to engage the internal tapered tace of the outer airnozzle, an inner liquid nozzle formed integral with said outer airnozzle, said inner liquid nozzle having an internal bore and a taperedportion with a tip extending through an opening formed in the center ofthe cap. A

2. An air 'brush nozzle comprising an outerair nozzle havingr aninternal tapered seat and an internally threaded portion, a cap, saidcap having an external thread and an external taperedfaee adapted toengage the internal tapered face of said outer air nozzle and an innerliquid 'nozzle formed integra-l with said outer air nozzle, said innerliquid nozzle having an internal bore, a tapered portion and a tipextending through an opening formed in the center of said cap.

3. An air brush nozzle comprising an outer air nozzle, an inner liquidnozzle formed integral with said outer air nozzle, said inner liquidnozzle having a threaded extension adapted to be screwed intothe end ofa delivery head of an air brush, said outer nozzle having an internaltapered seat, a cap having a tapered face adapted to engage saidinternal seat of said outer air nozzle, said inner liquid nozzle havinga tapered portion terminating in a tip adapted to extend through anopening in said cap, there being an annular rov7 of apertures lyingparallel with said inner nozzle forming air passages through said airbrush nozzle.

4. An air brush nozzle comprising an outer air nozzle, an inner liquidnozzle formed integral with said outer air nozzle, said inne-r liquidnozzle having a threaded extension adapted to be screwed into the end ofthe delivery head of an air brush, said outer nozzle having aninternally threaded section and a tapered internal seat on the outeredge thereof, a cap having external threads to engage with the internalthreads of the outer nozzle, the cap having an annular internal recess,the inner Wall of said recess being tapered to fit the internal taperedseat of the outer nozzle, the said inner liquid nozzle having a taperedportion terminating in a tip adapted to extend through an opening insaid cap, there being an. annular roiv ot apertures lying parallel`vvith said inner nozzle forming passages through said air brush.

In testimony whereof I have signed my name to this specification.

A. sHELBURNn.

